11.2 MORE PUNNETT SQUARE PROBLEMS

COMPLETE punnett squares to show the probable outcomes of each situation

HIGHLIGHT the assigned parental phenotypesIDENTIFY the parental genotypes

DETERMINE the probable genotype/phenotypes for the offspring

SIMPLE DOMINANCE

       

 

   

   

Guinea pigs: B=black fur b=white fur

B BB

b

BB BB

Bb Bb

Black = 100%

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

   

BB 50%Bb 50%

SIMPLE DOMINANCE

         

 

   

   

EARLOBES: F = free earlobes / f = attached earlobes

F f

F

f

FF Ff

Ff ff

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

 

FF 25%Ff 50%ff 25%

Free 75%Attached 25%

SIMPLE DOMINANCE

       

 

   

   

ALBINISM: A = no albinism a = albinism

A Aa

a

Aa Aa

Aa Aa

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

   

Aa 100%

No albino

INCOMPLETE DOMINANCE

       

 

   

   

CARNATIONS: R = red r = white Rr = pink

R Rr

r

Rr Rr

Rr Rr

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

   

Rr 100%

Pink 100%

CO-DOMINANCE

       

 

   

   

HORSES: R = red r = white Rr = roan

R r

r

r

Rr rr

Rr rr

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

   Rr 50% rr 50%

Roan 50%White 50%

INCOMPLETE DOMINANCE

       

 

   

   

HAIR: H = curly hair h = straight hair Hh = wavy hair

H Hh

h

Hh Hh

Hh Hh

GENOTYPESw/RATIOS

PHENOTYPESw/RATIOS

   

Hh 100%

wavy 100%

SEX LINKED TRAITS

       

 

   

   

FRUIT FLIES: R = red eyes r = white eyes

Xr yXR

Xr

XRXr

XRy

XrXr Xrywhite eyes = 50%

CIRCLE the offspring that have white eyes.

SEX LINKED TRAITS

       

 

   

   

HEMOPHILIA: H = normal blood h = hemophilia

XH yXH

Xh

XHXH XHy

XHXh Xhy

males = 50% hemophiliafemales = 50% carriers

CIRCLE the offspring that have hemophilia.

MULTIPLE ALLELES

ABO BLOOD TYPE:        

   

   

IA i IB

i

IAIB IBi

IAi ii

AB / B / A / OYES—if both parents are heterozygous

PHENOTYPE GENOTYPE

A IAi

B IBi

O ii

MULTIPLE ALLELES

ABO BLOOD TYPE:        

   

   

IA IB

IB

i

IAIB IBIB

IAi IBi

Pages BakersBaby #1--A Baby #2--O

   

   

IA i IB

i

IAIB IBi

IAi ii